Figure 2. Stereoview of the 2.2 Å resolution 2Fo-Fc omit map (1.2σ contour level) of palmitic acid inside (A) and outside (B) the pentameric channel.

The electrostatic fixation of the carboxylate head group of palmitic acid inside the channel (A) is symbolized by red dotted lines. Individual side chains are labelled. Water molecules are drawn as red spheres.